Amplifier



FIG. 1 is a perspective view of a amplifier showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

Portions in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an amplifier, as shown and described. 